Status: Accepted
Owner: [email protected]
CC: [email protected]
Labels: Type-Bug Priority-Medium
New issue 1795 by [email protected]: Test-case demonstrating 9x
degradation since 3.1
http://code.google.com/p/v8/issues/detail?id=1795
Fedor Indutny ([email protected]) provided a test case that shows 9x
degradation that happened since version 3.1
(https://gist.github.com/9e4ede5c4f6d45d663d0). I've made it into a single
file test case:
% bleeding_edge/d8
test.js 51463
applications in 5000 ms.: 0.09715718088723937 ms. per application
% 3.1/d8 test.js
493061 applications in 5000 ms.: 0.010140733093876822 ms. per application
Majority of the regression comes from r4783 which causes objects created
from the same object literal containing function literal (e.g. {a: function
() {} }) to have different maps.
% r4782/d8 test.js
416648 applications in 5000 ms.: 0.01200053762408556 ms. per application
But there are also other performance drops, e.g. the isolate land caused 3%
regression and some other changes which I have not tracked down are
responsible for another 15%.
We should consider rolling r4783 back.
Attachments:
test.js 74.3 KB
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